稀燃汽油机运转工况对吸附还原法降低NO_x排放的影响  

Effect of the Operation Conditions of the Lean Burn Gasoline Engine on Reduce the NO_x Emissions by Adsorber-Reduction Catalyst

作　　者：李志军[1] 孙小明[1] 马小强[2] 李洧[3] 方茂东[3] 刘书亮[1] 

机构地区：[1]天津大学内燃机燃烧学国家重点实验室,天津300072 [2]天津内燃机研究所,天津300072 [3]中国汽车技术研究中心,天津300162

出　　处：《燃烧科学与技术》2005年第3期224-229,共6页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(50276042);国家自然科学重点基金资助项目(59936130).

摘　　要：应用传统的三效催化器和稀燃NOx吸附还原催化器组成的新型复合尾气催化系统对稀燃发动机不同转速和负荷工况下的排放特性和燃油经济性的影响进行了实验研究.结果表明:稀燃发动机转速对其有害气体排放和燃油经济性的影响与稀燃吸附还原催化转化器稀燃运行时间与浓燃还原运行时间比值大小和绝对时间大小有关.稀燃发动机负荷大小是影响稀燃发动机排放特性和燃油经济性的主要因素,负荷越大,NOx有害气体排放浓度越高,NOx催化转化率越小,燃油经济性越好.The effects of the new catalyzing system consisting of traditional three way catalyst converter and adsorber-reduction catalyst converter on the emission characteristics and fuel economy of lean burn SI engine operated under different speeds and loads were investigated. The results show that the effects of speed on the exhaust gas emission and fuel economy are related with the ratio value and the absolute time of lean burn and rich burn. The engine load is the major factor affecting the emission characteristics and fuel economy of lean burn SI engine. With the increase of engine load, the concentration of NOx emission becomes higher, the NOx conversion decreases and fuel economy improves.

关 键 词：稀燃 汽油机 吸附还原法 氮氧化物 排放 

分 类 号：TK411.5[动力工程及工程热物理—动力机械及工程]